Machine for grinding chasers



R. E. FLANDERS MACHINE FOR' GRINDING GHASERS March 18, 1930.

4 Shets-Sheet 1,

Original Filed June 15, 1923 March 18, 1930. R. E. FLANDERS 1,750,956

MACHINE FOR GRINDING 'CHASERS Original Filed June 15. 1923 4Sheets-Sheet 2 W E Z/Z l I It i g I 1 '6' J March 18, 1930. R. E.FLANDERS 1,750,956

MACHINE FOR GRINDING CHASERs 7 Original Filed June 15. 1923 4Sheets-Sheet 5 40' v 3,1 ,Arr

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March .1s,'193o.

- Original Filed June- 15 1923 R, FLANDERS 1,750,956

MACHINE FOR GRINDING CHASERS 4 Sheets-Sheet 4 Patented Mar. 18 19 30UNITED STATES PATENT OFFICE BALI; E. FLANDEBS,

OF SPRINGFIELD, VERMONT, ASSIGNOR T-O JONES & LAMSON MACHINE COMPANY, OFSPRINGFIELD, VERMONT,

A CORPORATION or VERMONT MACHINE FOR GRINDING CHASERS Application filedJune 15, 1923, Serial No. 645,515. Renewed June 151929.

This invention relates to a machine for' grinding chasers such as areused to cut threadsin automatic lathes, screw machines and the like, andprovides a construction wherein the chaser and grinding wheel are causedto be relatively traversed to grind the length of the chaser threads andto be autolines 33 and 44, respectively, of Figure 2.

Figure 5 is a section on line 55 of Figure 3, the position of the camdrive shaft being indicated. 5 Figure 6 is a detail section on line 6-6of Figure 5.

Figure 7 is a fragmentary section on line 7-7 of Figure 5.

Figure 8.is an end view of the machine parts being broken away and thework carrier and related parts removed.

Referring to these figures, 1 indicates a machine base, on the upperface of which is mounted for rectilinear motion a traversing carriage 2,this carriage being supported to slide on suitable guideways 3. In theembodiment shown, at one side of this carriage (Figures 1, 2, 3 and 8)is a substantially cylindrical frame 4 to the end of which is. 1'0-tatably fixed, as by clamps 5, a disk 6 having a laterally extending arm7, this disk andarm having bearings 8 for a grinding wheel shaft 9, theangle of which relative to the horizontal may be varied by turning thedisk 6 and fixing it in position by means of the clamping bolts 5. Thisadjustment is not necessary for the purposes of the present invention,the plane of the wheel being vertical at all times but is a feature of amachine which,

, with some modification, may be employed in the practice of thisinvention. For an understanding of other advantageous functions ofthismachine, which however, are not nec essary for an understanding ofthe present invention, reference may be had to my application forpatent, Serial Number 564,091, filed May 27, 1922, for grindingmachines. This shaft 9 carries a grinding, wheel 10 having its face 11formed to properly grind the threads of the chaser. Opposite the arm 7the shaft 9 has fixed thereto a belt pulley 12 over which passes a belt13 extending through an opening 14 in'the arm 7 to a. pulley of adriving motor 15 supported on the frame 4. The frame 4 is permitted amovement"toward and from the carriage 2 and transversely of the motionof this carriage so that the wheel may be advanced to cut the workcarried by the carriage or be retracted to clear the work. Extendingupwardly from the carriage is a bracket 20 to the upper end of which ispivoted at 21 a bell crank lever 221 This lever has a substantiallyhorizontally disposed arm 23 which at its outer end is pivoted to avertically arranged slide' 24 mounted to slide in a suitable dovetailguideway 25 of the bracket 20, this being shown more particularly inFigure 2. Theforward face of this slide 24 is cut away as at 26 and isso formed as to provide-a seat against which the 27 of the chaser 28 maybear. The chaser may be held in position by any suitable means, but asherein shown a clamp bridge 30 is employed extending over the chaser andmade fast to the bracket and through this bridge is positioned a setscrew 31 having its inner end bearing against the outer face of thechaser. The bell crank lever 22 is oscillated to move the outer end ofits arm 23 up and down and so cause a vertical traverse of the chaser.by means of a follower 36 thereon engageable within a cam groove 37 of acam 38. This cam is fixed to rotate-with a shaft 39 extendinglongitudinally of the carriage and journaled in suitable lugs therein.This shaft 39 has fixed thereto a long gear 40 with which meshes a gear41 mounted to rotate on a stub This action may be effected somewhatirregular face shaft 42. This gear 41 also meshes with a fixed theretogear 45 meshes with a pinion fixed to a shaft 51 and this shaft has agear 52 meshing with a gear 53 fixed to the main drive shaft 54. A Thisdrive shaft extends outwardly of the machine frame whereon it carriesany suitable drive mechanism. As herein shown a belt wheel 55 is madefast tothis shaft. The shaft 44 also extends outwardly of the machineframe where it has fixed thereto a gear which meshes with a similar gear61 on a shaft 62. This shaft 62 extends through the machine frame andhas at its opposite end, as shown clearly in Figure 1, a worm 65 whichmeshes with a worm wheel 66 made fast to a cam,

drum 67 This-cam drum 67 carries cams which effect the traverse of thecarriage and which also effect a movement of the wheel toward and fromthe carriage.

- The traverse of the carriage is effected by 'mea s of a cam disk 70shown detached in Figure 6', this cam disk having a cam follower 71bearing thereon, this follower being carried atthe lower end of an arm72 dep endiiig from the carriage 2. As shown in igure 6 this cam isformed with a plurality of are shaped portions at progressivelydecreasing. distances radially from the axis of the cam drum. Thefollower 71 is held in engagement-with the cam 70 by means of a spring,80 reacting between a portion of the frame ina bracket 81 depending fromthe.

carriage. The traversing action of the carriage; is merely for thepurpose of feeding the chaser so that its several threads may be actedon-successively by' the grinding- Wheel, while the cutting traverselengthwise 0f the threads is effected by the vertical sliding of themember 24. This cam drum also carries a cam enlargement 75 which acts oning traverses by successive steps. When all the threads have been actedupon in this manner the cam 70then acts to return the carriage to itsformer position and at the same out departing from-its spirit or scopeas defined by the appended claims.

I claim:

1. In a machine of the class described com prising a grinding wheel, acarriage movable substantially parallel to the axis of rotation of saidwheel, a chaser holder movable transversely of said carria 'e to effectrelative traversing movement etween the cutting face of said wheel andthe chaser lengthwise of the threads thereof, means for reciprocatingsaid holder, and means actingautoinatically between its traverses tomove said carf riage to cause successive traverses between the wheelandchaser-to be effected on adjacent threads."

2. A machine of the class described comprising a grinding wheel, a'carriage movable substantially parallel to the axis of said wheel, aslideway on said carria e, a slide movable on said way parallel to t e,plane of rotation of 'said wheel, means to clamp a chaser on said slidewith its threads extendmeans for efiecting a relative movement saidwheel and carriage to cause said wheel to approach and recede from thethreads of the chaser, block to cause said wheel to traverse lengthwiseof said threads and means acting between successive traverses to movesaid carone arm 76-0f the bell crank lever (see F igs e Q P Successivetrfwerses to efiect ures 7 and 8), the other end of this armeng afitlonon Successlve threadsgaging at 77 a member 78 having a connection withthe frame 4 (see Figure 8). When the high spot of this cam is reachedtherefore, the member 78 is pushedrea'rwardly by action of the cam 75thereon and the wheel is thus pushed backwardlyout of contact with thework supported on the carriage, a spring 9 engaging at one end a lug 80depending from the frame 4 and at its'other end fixed to a portion ofthe frame 1 being employed to urge the wheel forwardly. The action ofthe mechanism, therefore, is to cause a vertical reciprocation of theslide 24 carrying the chasertherewith so that as the chaser threads are'presented to the grinding wheel they are ground to a plane surfacelengthwise. After each traverse has been effected dr-um having a pair ofcam elements ofthe chaser,

v 3. In a machine of the class described-comprising a grinding wheel, acarriage movable ing parallel to .its direction of rotation,

means to effect sliding of.said,

substantially parallel to the axis of said f wheel, a slideway on saidcarriage, a slide -movable on said way parallel to the planeiof rotationof said wheel, means for clamping a chaser on-saidslide with its threadsextending parallel to its direction of sliding motion, a shaftjournaledlongitudinally in said carriage, a cam'on said shaft, leverconnections from said cam for reciptrocating said slide on 1017313101101 said sha a cam on, a follower fixedito saidcarriage inoperativeengagement with one of said cam elements-for causing a step .by stepmotion of there'- said carriage between successive reciprocations ofsaid slide to present the cutting face of said wheel successively toadjacent threads a a another follower in operative engagement with" saidother cam elementtoj advance and retract saidswheel toward and from thechaser to cause said wheel to engage and then to clear the chaser, andmeans for driving said cam and said cam drum in proper timed relation.

I haye afiixed my In testimony whereof signature.

RALPH E. FLANDERS.

